Another related area is called "affective bci", measuring emotional valence / response.

https://www.google.com/search?as_q=affective+bci&as_sitesearch=openbci.com

* (simple) Affective BCI (concentration, meditation, sleep)

* (simple) Affective BCI (concentration, meditation, sleep)

* (simple) Affective BCI (concentration, meditation, sleep)

re: "train the data then classify it...", it's not clear that ML / DL is being widely applied to affective BCI.

There are some related posts under the phrase "affective bci", here on the forum. This search produced using the Google Advanced Search button in upper right,

Affective BCI is a huge field, choose your focus and look at relevant papers.

About the affective BCI, how to get the scalp projection image from EEG data?

re: emotion detection, the larger term for this is "affective BCI". Yes any EEG cap, electrodes or headset could be used.

The wider term is affective BCI

brain-computer interfacing, and cognitive and affective monitoring. We extract trends and highlight interesting approaches in order to inform future research and formulate recommendations. Various da

http://openbci.com/forum/index.php?p=/search&Search=affective

Thanks @wjcroft, I have read through the discussion and it does sound interesting. I do hope that OBCI will become more end user oriented in the future, with 1 on 1 guides on how to use it affectivley

http://openbci.com/forum/index.php?p=/discussion/325/functions-linked-to-10-20-locations-abci-affective-bci

Here is some research on emotion recognition, also called Affective BCI, 

On a related area, here is some research on emotion recognition, called Affective BCI,

http://openbci.com/forum/index.php?p=/discussion/325/functions-linked-to-10-20-locations-abci-affective-bci

Checkout these existing threads, the first directly relates to aBCI Affective (emotion) driven BCI.

http://www.affective-sciences.org/aBCI2015